Operating Instructions
Machine Description
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4.6.10 Substrate discharge at the unwinding unit
Purpose
Elimination of any electrostatic charges.
Technical realization
High-voltage electrostatic fields and alternating polarity neutralize any elec-
trostatic charges of the material to be printed.
Fig. 27. Substrate discharge at the unwinding unit
Pos. Element
Meaning
1
Electrode
+100-E1
Eliminates electrostatic charges on the side of
the substrate to be printed.
2
Electrode
+100-E2
Eliminates electrostatic charges on the opposite
side of the substrate.
Pure plastic foils or printing materials which also contain plastic
– for exam-
ple so-
called “peel-push foils” or textiles made of synthetic fibers – take on
an electrostatic charge during the unwinding and diverting processes. Since
such charges dissipate only very slowly into the air, and the substrate, as
well as most of the printer’s guide rollers, is non-conductive, these charges
remain "captured" in place until eventually the areas in question are ex-
posed to an electrically conductive object, at which point the following could
then occur:
the substrate would be attracted by the oppositely charged objects and
remain stuck there, which could cause it to tear,
1
2